A280714 Partial products of A055067.

1, 1, 2, 6, 144, 2880, 2073600, 1306368000, 17557585920000, 637129677864960000, 2312016175036366848000000, 640890883720080890265600000000, 306987758727332698566646824960000000000, 136544225638605874463902854662848512000000000000

Offset: 1

Author

Jaroslav Krizek, Jan 07 2017

Keywords

• nonn

Comments

A055067(n) = the product of non-divisors of n.

Crossrefs

Cf. A000178, A055067, A092143, A280713.

Programs

Magma

[&*[Factorial(k) / &*[d: d in Divisors(k)]: k in [1..n]]: n in [1..100]];

Mathematica

FoldList[#1 #2 &, Table[Times @@ Complement[Range@ n, Divisors@ n], {n, 14}]] (* Michael De Vlieger, Jan 09 2017 *)

Formula

a(n) = Product_{i=1..n} A055067(i).

a(n) = A000178(n)/A092143(n). - Amiram Eldar, Aug 16 2025